Preparation Process and Development Prospect of Foam Printing Pulp

Examples of foam coating paste formulations are as follows:

The above formula is prepared into a foam solution and then mixed with the paint paste to prepare a good printing paste, which can be printed on a fabric (such as a cotton fabric) by a garden screen printing machine. The printed fabric is dried and then heat treated at 150° C. for 3 minutes.

The British company Alliea Colloias recommends the use of the thickener A1coprint PTF for foam printing of paints, which can produce extremely stable foams and can be used on garden screen printing machines.

Examples of typical printing paste formulations:

The paste has a viscosity of about 5 Pa after mixing. s, from the pulp and the volume of air mixed to produce a foam ratio of 5: l foam, the printing effect is particularly soft and clear (foam ratio of the coating printing effect can see the results in Table 1 above) .

What should be noticed in the foam printing process operation?

(1) Before printing, the printing equipment such as flower cylinders, garden nets, and flat nets should be thoroughly cleaned to remove the defoaming oil so as to avoid unnecessary trouble in printing.

(2) In flat screen printing, the color paste should be added in a small amount and continuously, so as to avoid surface drying during a long operation, blocking the screen mesh hole, and the squeegee pressure is the same as or slightly larger than the conventional printing.

(3) In the park screen printing, the colorant transfer pipeline should be smooth, and the pipeline should not be too long.

(4) In roller printing, the pattern engraving should not be too deep, the scraper should be very sharp, and the sizing roller should be short stiff.

(5) Dilution can be performed using the same slurry with the same foaming ratio, but uniform mixing is required before printing.

(6) Unused foam pastes can be stored for 2 to 3 days. The stored foam volume should be marked before storage so that the original volume can be restored with simple agitation before use. The storage container should be covered and sealed in a cool place to prevent the foam system from being destroyed due to the increase of ambient temperature.

(7) Paint foam printing paste If you control the same foaming ratio, increase the amount of adhesive, printing viscosity will increase, the foam stability will increase, if you increase the amount of thickener, it will improve the foam stability, it is better than The effect of using stabilizers is also significant, but the amount should not be too much, otherwise it will affect the foam discharge rate.

(8) If continuous foam printing is used for a long period of time, if only one slurry tank is used to supply the foam paste, the foam paste must be continuously stirred slowly.

(9) Prevent paint foam paste from contacting with acids, alkalis, alcohols and other chemicals so as not to damage the foam system.

(10) Foam printing has the advantages of softer printing and higher surface color yield than conventional printing. However, the biggest research topic in the industry is how to ensure that the foam density does not change during the entire printing operation. Otherwise, the density of the printing results in inconsistent print density. Different shades.

(11) The foam size should be controlled in a consistent manner, otherwise it will bring bad printing effect, and the foaming ratio will not be increased in the printing process, otherwise it will cause light color or dragging knife and other adverse consequences.

What is the development prospect of bubble printing?

The earlier success of the foam printing and dyeing technology was the Sancowad dyeing method in Switzerland. Subsequently, various countries competed to research the foam dyeing, finishing and printing technologies. More than 30 companies abroad have developed foam dyeing and finishing equipment, including the famous FFT system of Gaston County, Germany, and Kussel (Germany). Kusters's single-sided and double-sided foam dyeing machines, Stoke, The Netherlands, Stork Brabant's Parknet Foam Printing Machine, Austria's Zimer Magnetic Bar Foam Printing System, etc. In China, SP and SP2 double-sided foaming machines and YJ-200-800 foaming machines have also been developed. On the basis of the successful development of foam preparation in China, active research and development work is also underway for foam printing. For example, Donghua University (formerly China Textile University) cooperates with Wuxi Printing and Dyeing Factory and Changzhou No. 4 Printing and Dyeing Factory to apply direct, active, dispersed Such as dyes and coatings, using direct printing process, in the manual platen, flat net, garden nets and roller printing machine, a successful foam printing production, printing a large number of fabrics. The experience gained from a large number of experimental productions: It is also necessary to improve the cultivation from the aspects of foam stability and print clarity, and research and development of a simple and versatile foam dispenser and foam should be developed. Applicators can be easily applied. Producing foam with certain characteristics is the key to foam printing technology. Some factories use ordinary mixers to stir at 2000r/min for 8 minutes to obtain good foaming effect. Among them, there are two methods that are more successful: One is the use of existing conventional equipment, a slight improvement, and the addition of special foaming equipment. It is not very costly and easy to accept, and the other is the selection of strong-leaching foaming agents. Only need to regulate the flow to achieve the foam application parameters, easy to control, more accurate, better adaptability and attention. By the ten-bubble printing, the liquid absorption rate is low, and COSCO can save the infrared pre-drying device and can accelerate the speed and other advantages (Wen / Liu Yongqing)